/*!	 valuenode_compare.cpp
**	 Implementation of the "Compare" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**	Copyright (c) 2009 Nikita Kitaev
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "valuenode_compare.h"
#include "valuenode_const.h"
#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_Compare, RELEASE_VERSION_0_62_00, "compare", "Compare")

ValueNode_Compare::ValueNode_Compare(const ValueBase &x):
    LinkableValueNode(x.get_type())
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);
    bool value(x.get(bool()));

    set_link("lhs",          ValueNode_Const::create(Real(0)));
    set_link("rhs",          ValueNode_Const::create(Real(0)));
    set_link("greater",      ValueNode_Const::create(bool(false)));

    if (value) {
        set_link("equal", ValueNode_Const::create(bool(true)));
    } else {
        set_link("equal", ValueNode_Const::create(bool(false)));
    }

    set_link("less",         ValueNode_Const::create(bool(false)));
}

ValueNode_Compare*
ValueNode_Compare::create(const ValueBase &x)
{
    return new ValueNode_Compare(x);
}

LinkableValueNode*
ValueNode_Compare::create_new()const
{
    return new ValueNode_Compare(get_type());
}

ValueNode_Compare::~ValueNode_Compare()
{
    unlink_all();
}

bool
ValueNode_Compare::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(lhs_,      type_real);

    case 1:
        CHECK_TYPE_AND_SET_VALUE(rhs_,      type_real);

    case 2:
        CHECK_TYPE_AND_SET_VALUE(greater_,  type_bool);

    case 3:
        CHECK_TYPE_AND_SET_VALUE(equal_,    type_bool);

    case 4:
        CHECK_TYPE_AND_SET_VALUE(less_,     type_bool);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_Compare::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    if (i == 0) {
        return lhs_;
    }

    if (i == 1) {
        return rhs_;
    }

    if (i == 2) {
        return greater_;
    }

    if (i == 3) {
        return equal_;
    }

    if (i == 4) {
        return less_;
    }

    return 0;
}

ValueBase
ValueNode_Compare::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    Real lhs      = (*lhs_)(t).get(Real());
    Real rhs      = (*rhs_)(t).get(Real());
    Real greater  = (*greater_)(t).get(bool());
    Real equal    = (*equal_)(t).get(bool());
    Real less     = (*less_)(t).get(bool());

    if (greater && lhs > rhs) {
        return true;
    }

    if (equal && lhs == rhs) {
        return true;
    }

    if (less && lhs < rhs) {
        return true;
    }

    return false;
}

bool
ValueNode_Compare::check_type(Type &type)
{
    return type == type_bool;
}

LinkableValueNode::Vocab
ValueNode_Compare::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "lhs")
                  .set_local_name(_("LHS"))
                  .set_description(_("The left side of the comparison"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "rhs")
                  .set_local_name(_("RHS"))
                  .set_description(_("The right side of the comparison"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "greater")
                  .set_local_name(_("Greater"))
                  .set_description(_("When checked, returns true if LHS > RHS"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "equal")
                  .set_local_name(_("Equal"))
                  .set_description(_("When checked, returns true if LHS = RHS"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "less")
                  .set_local_name(_("Less"))
                  .set_description(_("When checked, returns true if LHS < RHS"))
                 );

    return ret;
}